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LVM is a logical volume on top of a physical disk system. If your physical disk system is a RAID and your hardware supports hot-swap then you should be able to hot-swap and the data will recover.
If you've just used LVM to span a volume across two physical disks without RAID and one has failed then you'll need to replace the disk, recreate the whole volume and then restore your data from last nights backup.
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LVM issues
